package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 前置通知,在通知中为公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始公共字段填充");
        //获取当前方法上数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取到当前被拦截的方法参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object arg = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据操作的不同类型为对象赋值
        //添加
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(arg, now);
                setCreateUser.invoke(arg, currentId);
                setUpdateUser.invoke(arg, currentId);
                setUpdateUTime.invoke(arg, now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }//修改
        if (operationType == OperationType.UPDATE) {
            try {

                Method setUpdateUTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值

                setUpdateUser.invoke(arg, currentId);
                setUpdateUTime.invoke(arg, now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
//单一创建时间
        if (operationType == OperationType.CREATION) {
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(arg, now);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}
